diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 867d689ee..8de708172 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.5.1
+current_version = 0.5.2dev0
 commit = True
 tag = True
 
diff --git a/VERSION b/VERSION
index dd9b22ccc..669e6f35c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-__version__ = "0.5.1"
+__version__ = "0.5.2dev0"
diff --git a/docs/changelog.rst b/docs/changelog.rst
index a7815ef88..da0b2f4a9 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -9,6 +9,7 @@ These are new features and improvements of note in each release
     :backlinks: top
 
 
+.. include::  whatsnew/v0-5-2.rst
 .. include::  whatsnew/v0-5-1.rst
 .. include::  whatsnew/v0-5-0.rst
 .. include::  whatsnew/v0-4-5.rst
diff --git a/docs/conf.py b/docs/conf.py
index 12972c768..05665cac1 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -36,7 +36,7 @@ def setup(app):
 year = "2014-2023"
 author = "oemof-developer-group"
 copyright = "{0}, {1}".format(year, author)
-version = release = "0.5.1"
+version = release = "0.5.2dev0"
 
 pygments_style = "trac"
 templates_path = ["."]
diff --git a/docs/whatsnew/v0-5-2.rst b/docs/whatsnew/v0-5-2.rst
new file mode 100644
index 000000000..d9d20b7be
--- /dev/null
+++ b/docs/whatsnew/v0-5-2.rst
@@ -0,0 +1,23 @@
+v0.5.2 (????)
+-------------
+
+API changes
+###########
+
+New features
+############
+
+Documentation
+#############
+
+Bug fixes
+#########
+
+Testing
+#######
+
+Other changes
+#############
+
+Contributors
+############
diff --git a/setup.py b/setup.py
index 8bbc36a0a..392b3d1b0 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@ def read(*names, **kwargs):
 
 setup(
     name="oemof.solph",
-    version="0.5.1",
+    version="0.5.2dev0",
     license="MIT",
     description=(
         "A model generator for energy system modelling and optimisation."
diff --git a/src/oemof/solph/__init__.py b/src/oemof/solph/__init__.py
index d96fb5ed1..4ea8f8a15 100644
--- a/src/oemof/solph/__init__.py
+++ b/src/oemof/solph/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.5.1"
+__version__ = "0.5.2dev0"
 
 from . import buses
 from . import components